Engine



Dec. 9, 1924. 1,518,673

P. A. PEARCE ENGINE Filed p l 1924 2 Sheets-Sheet 1 "II-mumm- B H.Pearce m INVENTOR My WITNESS: ATTORNEY Dec. 9,

P. A. PEARCE ENGINE Filed April 12 1924 2 Sheets-Sheet 2 .8. PearceINVENTOR ATTORN Q- JZ .5 v /m/m/m m ll mmm WWII WITNESS:

Patented Dec. 9 1924.

UNITED STATES PRINCE ALBERT PEARCE, 0F NORRIS CITY, ILLINOIS.

i ENGINE.

Application filed April 12, 1924.

To all whom it may concern:

Be it known. that I, PRINoE ALBERT PEARoE, a citizen of the UnitedStates, residing at Norris City, in the county of White and State ofIllinois, have invented new and useful Improvements in Engines, of whichthe following is a specification.

This invention relates to internal combustion engines and has for itsobject the provision of an engine so constructed and arranged as toeliminate all necessity for the employment of the usual valves, rockerarms, cams and other devices involved in valve actuation, the advantagebeing that losses caused by leakage at various points will be prevented.

An important and more specific object is the provision of an engine ofthis character in which the valve arrangement consists of ports in theengine cylinders successively covered and uncovered by ported pistonswhereby the intake and exhaust will be controlled automatically.

A further object is the provision of an engine of this character whichwill be simple and inexpensive in construction, easy to control andoperate, smooth and powerful in action, eflicient and durable in serviceand a general improvement in the art.

With the above and other objects and advantages in view the inventionconsists in the details of construction to be hereinafter more fullydescribed and claimed and illustrated in the accompanying drawings, inwhich:

Figure 1 is a longitudinal section through an engine constructed inaccordance with my invention,

Figure 2 is a horizontal cross section on the line 2-2 of Figure 1,

Figure 3 is a horizontal cross section on the line 33 of Figure 1 andFigure 4 is a detail section through the intake valve taken on the line4-4 of Figure 1.

Referring more particularly to the drawings I have shown the engine ascomprising a base or crank case 10 on which is bolted at 11 the cylinderstructure 12. In the present instance one twin cylinder is shown and itis obvious that as many units as desired may be provided. Within thecrank case is the usual crank shaft 13 mounted in suitable bearings 14and formed with a crank portion 15 with which is engaged a connectingrod 16 in turn connected with a cross-head Serial No. 706,155.

17 movable longitudinally within the case 10.

The cylinder structure or unit 12 includes two compartments or cylinders18 and 19 separated by a division wall 20 which terminates short of thecenter of the cylinder head 21. All the walls are formed with passages22 and the head is formed with a space 23 therein, all for the purposeof providing: space for the circulation of water to effect cooling. Aspark plug 24 or other ignition device is threaded through the usualhole in the cap at a point immediately above the division wall 20.Mounted for reciprocation within the cylinders 18 and 19 are pistons 25and 26 respectively carried by piston rods 27 which are connected withthe slide 17. The piston 25 is formed with a passage 28 extendingtherethrough from top to bottom while the piston 26 is formed with anl.- shaped passage 29. At the top of the piston 25 is an upwardlyopening normally spring closed'check valve 30 for a purpose to bedescribed. Quite naturally the pistons are provided with the usualpacking rings 31 to prevent leakage.

At one side of the cylinder unit is an intake manifold 32 connected witha suitable carburetor not shown and communicating with the interior ofthe cylinder 18 through upper and lower ports 33 and 34 respectively,which ports are adapted to be covered and uncovered successively by thepiston 25- A spring pressed upwardly opening check valve 35 is locatedin the intake manifold 32 as shown. The cylinder 19 has its wall formedwith an exhaust port 36 communicating with an exhaust pipe 37 for theoutlet of exploded or burnt gas.

In the operation, it will be seen that both pistons operate in unison.On the upstroke of the piston 25, suction is produced below it and acharge of mixture is sucked in through the port 34. The previouslyadmitted charge in advance of the piston 25 is compressed between bothpistons and the cylinder head is exploded by the spark plug 24. As bothpistons successively move downwardly on the working stroke, the L-shapedpassage 29 will come into registration with the port 36 so that theexhaust gases will escape. On this working stroke, the previouslyadmitted charge of mixture below the piston 25 will pass through thepassage 28 and enter the space above the piston. When the piston 25reaches its lowermost position, the port 33 is uncovered which Will.permit an additional supplyto enter the cylinder. At all times theoperation of the pistons in unison together With the transferring of afresh charge through the piston 25 will operate to insure proper actionso that there will be great smoothness in the running of the motorcombined With maximum power. The principal teature of advantage is thatthere are no elaborate valves and valve actuating mechanisms to get outof order and cause leakage, uneven running, noise and the like.

While I have shown and described the preferred embodiment of myinvention it is of course to he understood that I reserve the right tomake such changes in the form, construction and arrangement of parts asWill not depart from the spirit of the in vention or the scope of thesuhjoined claims.

I claim:

1. In an internal combustion engine, a crank case having a crank shafttherein formed With a crank portion, a slide mounted Within the crankcase and connected with said crank portion, a cylinder unit divided intosimilar cylinders, one cylinder having spaced intake ports communicatingwith an intake manifold and the other having an exhaust port, andpistons mounted within the respective cylinders and connected with saidslide, one piston having a transfer passage therethrough and the otherhaving an exhaust passage.

2. In an internal combustion engine, twin cylinders arranged side byside, an intake port for one cylinder, an exhaust port for the'other,said cylinders having communication at their outer ends, pistons mountedithin the cylinders for simultaneous movement, an exhaust port in onepiston adapted to register f ith the first named exhaust port and avalved transfer passage'in the other piston.

3. In an internal combustion engine, a

pair of similar cylinders, a division Wall separating the cylinders andterminating short of the ends thereof, a head, an ignition deviceextending through the head at a point opposite the division Wall, onecylinder having upper and lower intake ports and the other having asingle exhaust port, pistons slidalole Within said cylinders and onehaving a valved transfer passage and the other having an exhaust passageadapted to register With said exhaust port, and means connecting thepistons for simultaneous movement.

i. in an internal combustion engine, a pair of similar cylinders, adivision Wall separating the cylinders and terminating short of the endsthereof, a head, an igni tiondevice extending through the head at apoint opposite the division Wall, one cylinder having upper and lowerintake ports and the other having a single exhaust port, pistonsslidahle Within said cylinders and one having a valved transfer passageand the other having an exhaust passage adapted to register With saidexhaust port, and means connecting the pistons for simultaneousmovement, including a slide, rods connected with the slide and thepistons, and a crankshaft having crank portion connected With the slide.

5/111 an engine, a pair of cylinders arranged side by side andcommunicating at their outer ends, one cylinder having a pair of intakeports therein arranged in longitudinally spaced. relation and the othercylinder having an exhaust port, a pair oi simultaneously moving pistonsWithin the cylinders, the piston Within the first named cylinder havinga valved transfer passage therein and the other piston having a portadapted to register With said exhaust port. In testimony whereof Ia'liix my s1gna ture.

PRINCE ALBERT PEARCE.

